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Figure 4
HRTEM images of BNNTs. (a) A low-magnification TEM image of the BNNT sample. The inset shows an SEM image revealing the typical fluffy cotton-like morphology of BNNTs. (b) An HRTEM image revealing the typical fluffy cotton-like morphology of BNNTs with coexisting mono-layer and multi-layer BNNSs. (b′), (b′′) Magnified images in the squares in (b). The inset in (b′) shows the FFT pattern obtained from the square on the left BNNT, revealing evidence for the zigzag AAh BN helix. The multi-layer BNNS (b′′) reveals the unique eye-like FFT patterns for AAh BN (insets).

IUCrJ
Volume 8| Part 6| November 2021| Pages 1018-1023
ISSN: 2052-2525
https://doi.org/10.1107/S2052252521009118